I'm talking 100-800ms. I was so off-put, even after changing a few settings, that I returned to Notepad++ for a while.
I'd never been so disgusted at a piece of software. It's the 21st century and we're dealing with input latency in a text editor???
Eventually they seemed to fix things and it started running better, and now on Linux it runs buttery smooth and is a joy to use, but clearly they were not finished with their work by the time this article was published.